[issue28408] Fix redundant code and memory leak in _PyUnicodeWriter_Finish

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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assignee:  -> serhiy.storchaka
stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28408>
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